Angular fan drive



April 26,A 1938. R. scHlTTKE ANGULAR FAN DRIVE Filed April 27, 1936 2Sheets-Sheet l April' 26, 193s.

R, SCHH-TKB 2,115,124

ANGULAR FAN DRIVE Filed April 27, 193s 2 sheets-sheet, 2

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n @TW I' i?,v 012( 70 Z gmc/Wto@ @Maffay/w@ Patented Apr. 26, 1938UNITED STATES ANGULAR FAN DRIVE Robert Schittke, Lansing, Mich.,assignor to General Motors Corporation, Detroit, Mich., a corporation ofDelaware Application April 27, 1936, Serial No. '76,535

3 Claims.

This invention relates to cooling systems and particularly to thecooling system applied to an internal combustion engine used on anautomotive vehicle.

i In the prior art radiators of the Water cooling systems of engines ofautomotive vehicles have been flat and positioned at the front of thevehicle immediately ahead of the engine. The trend of modern practice isto round and make narrower the front end of the vehicle which hasnecessitated the narrowing of the radiator and in some instances hascaused a decrease in the area of the radiating surface.

With a view to maintaining the radiating sur- ;,5 face of the radiatorcore ample for all purposes the radiator is made in angle form, or inthe shape of a V, so that the edge of the radiator may extend forwardlyVimmediately behind the usual grille and the sides diverge rearwardlytoward the two sides of the engine. This will eno able the use of alarger radiator core and give a greater radiating surface and in no wayinterfere with the narrowing of the front portion of the vehicle. Thismaking of a radiator into V shape insti- 'j tuted the problem ofproperly pulling the air through the radiator by the usual blade fan.The blades of the fan are ordinarily in the same plane where a straightcore radiator is used, but where a V-shaped radiator is used theordinary straight plane fan is not applicable so it was necessary toredesign the construction to utilize a blade fan which could bepositioned in the angle of the V of the radiator. Accordingly, the fanblades were bent rearwardly so that'in their rotation they generated acone. The shaft on which the fan is mounted projects Well forward intothe angle between the radiator halves while the blades rotate closeradjacent the radiating air through the core.

On the drawings Figure 1 shows in dotted outline the hood and wheels ofan automotive vehicle and in full lines 45 the front portion of theengine with the V radiator and novel fan applied.

Figure 2 is a plan view of the novel V-shaped radiator and fan.

Figure 3 is a view similar to Figure 2 of the 50 conventionalconstruction.

Figures 4, 5, and 6 show diiferent modifications of the application ofthe fan and the manner of driving it from the engine.

Referring to the drawings, the numeral 2 in- 55 dicates an automotivevehicle as a whole. The

ybracket is provided with the bearings 52 at the surface and aretherefore better able to pull the (Cl. 12S-170) i vehicle has the usualhood 4, the grille 6 at the front, the wheels 8, the engine lll havingthe oil pan l2, The engine has the usual crankshaft the end i4 of whichmay be seen in Figure 1. The usual cylinder head is indicated at I6 andfrom the cylinder head the tube I8 of the water cooling system leads tothe upper tank 253 of a radiator indicated as a whole at 22. Thecrankshaft i4 has Vthe fan belt pulley 24 secured thereto and -a secondfan pulley 26 is mounted on the engine above and in alignment with thefan pulley 24. A fan belt 28 passes around both pulleys 24 and 26 anddrives the pulley 26 from the pulley 24; The usual water pump housing isindicated at 39 in which there is positioned the water 15 pump 32(Figure li). The water pump S2 draws the water of the cooling systemfrom the bottom tank 33 of the radiator through the tube 34 and passesit into the engineV to cool the cylinders and other parts.

Referring to Figure 2 -it will be noted that the radiator 22 is in Vshape and is formed of the two halves 36 and 3B. Behind the radiator 22there is positioned the fan 4i! which is mounted on a shaft 42 to whichthe pulley 26 is lrigidly secured.

Referring to Figure 4 it Will be noted that the shaft 42 comprisestherear section 44 and the front section 4B connected to each other indriving relation by the gears 48. The shaft section 4S is mounted at anangle to the shaft section 44. The pump 32 is also secured to the shaft44 and operated thereby.

The rear shaft section 44 is mounted in a bracket B secured to theengine block. The 35 rear thereof and the roller bearings 54 at thefront end thereof. The shaft section Y46 is mounted in the rollerbearings 55 and 58 and has the fan rigidly mounted thereon by means 40of the pin 6i) passing through the hub B2 of the fan and through theshaft. Machine bolts 64 secure the fan blades 66 to the hub 62. Theshaft section 46 is mounted in the auxiliary bracket 68 which is securedto the bracket 5@ by 45 means of the machine bolts l0.

The usual means indicated at l2 and 14 for lubricating the shaftsections 44 and 46 are provided.

The structure in Figure 5 diifers from that 50 shown in Figure 4 in thatno water pump 32 is driven from the shaft section 44'. The bracket isused to mount the outer shaft section 46 instead of the inner section 44and the auxiliary bracket 68' has the bearings 52 and 54 in which 55k tomountthe'shaft 44. Thefan pulley 26 isV shaped slightly different thanthe corresponding pulley 26 in Figure4 buthas the samefunction.

The structure of Figure 6 differs from the struc- Y Ytureof Figure 5 inthat a universalV joint 48 is used instead of the gears 48Y in Figures 4and 5.

The universal joint .mayY be any conventional type ofrjoin't and VperVse forms no part of the in- VVention. In theembodiment shown two forkedYmembers interengage as shown so that'the outershaftsection 46 is drivenfrom` the inner shaft` section 44. The bearing 54'-l is in the form ofal sleeve instead of the ball bearing 54 shown in Figure 4; The shaftsection 46 is stepped -as Y shoWn'at/'IS and `has butga single vballbearing '58 to support it. The'hub 62 insteadof .being pinnedt'othejshaft end is Vsecured thereto by af j keyand slotconnectionl.,e`Y f Y' ,By' referring Vto-.Iiigures 1, 2V,V and 5 itwill be notedthatsthe blades lili4 of the fan'V instead of being ofthe shape'ofbladesBSVin'Fig'ureB (which f lis thelconventionalishape) arebent rearwardly Y[to forman angle with vthe Yshaft 46 'to' which the fan is'jattached.Accordingly, each blade, as it is rotated bythe shaft 415, generates aVconical surface. 'I-hishas been'V made necessary because with'a fan 40Ysuchas shown inliigure.3ft-wouldv A be impossible -to positionthe fanclose Vinward to- VVward the two halves-'36 and 38 ofthe radiator forthe reason Ithat thetips'of theblade'swould out intothe radiator. vBy'making it `angulargor diverg'ing toward the rear as shownV in Figures1,

2,'and-4, it has` beenfp'ossible to positionv the end'of lthe shaft 46well forward into ftheangl'e of 35` e Y n Y 66 torotate inV closerproximity to the radiator halves y36 and v38 so'that as 'the fan isdriven from the 1vol?Y theY radiator and cause the fan blades theuengineVY the closer interrelation betweenV the i fan andl radiator willenable the fan better to'VV draw the air through vtheradiator and to'drawsv substantially equal quantities through the two f halves 35 and'38..

' In'Figure 3'the usualtypeof radiator 22" and Vthefan 40Y oifer'noproblem because it is possible to position the fan close up to theradiator irre- Y rspecrtive of the length or diameter of thefan. Y

, the' radiator.

- Y V2. I n a cooling system Yfor they engine ofV an Y to the sides ofthe angmform'ed by the ofthe radiator.

This isl possible because the surface ofthe radi'- ator 22 is flat andthe fan 4D can easily be positioned closely adjacent the'radiator.

I claim: 1. In a cooling .systemk frorrthe engine of Van Y automotivevehicle, a VVshaped radiator mounted on the vehicle, a fan shaft mountedon and driven from the engine, a fan attached to theshaft and ipositioned immediatelyV behind and within thes'V LofV the radiator,blades on the fan, said blades v. r forming an acute angle with theshaft and gen-f` -erating acone in their rotation whereby to cause Y airbetter to pass through both'sides ofthe V of automotive vehicle, aVshaped radiator Ymounted Von the vehicle; a? two-sectioned fan shaftmounted u gon-.and driven fromrthe enginefrneansin the` shaft to enableone section thereof to be vdriven at Vananrgle tothe other section, Yavfan secured Y. .j to the end of the shaftr andpositio'nedimmedifatelybehind and'within the V ofthe radiator;y

the V shape"of"the radiator. -1

' blades on the fan, said blades forming 'an acute.,V .I

anglewith the shaft'fsection to which the fan is" attached toenabl'e thefan better to e5 conform yto;

InY a cooling system for Ythe enginefofean j automotive vehicle, aradiatori secured to Ythe engine',4 Vsaid Vradiator vhaving :oneVVsections thereof at an angle tothe other section; a two-sectioned)Vfan shaft mountedronand driven from the engine, one section y of said'shaft being tilted upwardly, e

ter -of vthe vcone and the radiatorfbeing parallel*V sections Y ROBERTsonrr'rrrr:.`Y Y

